perkins



RUSSELL B. PERKINS, CE MERIDEN, CONNECTICUT, :ASSICNCR Tol "CHARLES PARKEB, 0E` SAME PLACE.

LettersPatent No. 88,733, dated A19/rtl 6,1869.

' MECHANICAL ADJUSTMENT.

To all 'whom it ma/y concern Be it known that I, RUSSELLABPERKINs, of Meriden, in the county of New Haven, and Stateof Connecticut, have invented anew Improvement in Mechanical Adjustment; and I do'hereby declare the following, `when taken 'in connection with-the accompanying drawings, and 'the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent in l Figure 1, a front view, the face-plate removed.

Figure 2, a vertical central section, the face-plate attached; and in Figures 3 ande', detached views to illustrate the operation.

This invention relates to a mechanical adjustment, the object of which is to adjust the points of starting and stopping of a reciprocatingmovement without changing the extent of the said movement. To this end Y My invention consists in the arrangement of a slide or block attached to 'the wristpin, within a circular plate, around which an eccentric is arranged, the said eccentric governing the connection, so that by turning the eccentric, the connection is practically lengthened or shortened, as the case may be, and without chang- Ving the throw of the crank.

l In order to the clear understanding of my invention, I will fully describe the same as illustrated in the accompanying drawings.

For convenience of illustration l show 'my invention as applied to the slide of a press. v

A is a shaft upon which ya wrist or crank-pin, B, is attached, its eccentricity being proportionate to the reciprocating movement required.

On to the said wrist-pin, a block, a, is placed, so as to permit the Wrist-pin to turn freely therein.V

The said block is placed in a slot, b, of a circular plate, O, theisaid plate being held to prevent its turning by a tongue, j', lying in a slot, h, so that as the crank revolves, the block a moves to the rightor left, giving to the plate O simply a vertical movement.

Y Around the plate O is placed an eccentric, D, which may be tnrnedfreely around the plate O, the plate O being prevented from turning therewith by a tail-piece,

t, which lies in a groove in the face-plate E, as Iseen in figs. 2 and3, g. 3 showing the face-plate from the inside. l

vThe eccentric D is arranged in the slide F, or in whatevertheconnection may he from the crank to the thing-to be moved.

1 In the position seen in iig. 1, the eccentric is set s'o as to carry the connection or slide F so as to give the .extreme length lbetween the crank and thing to be moved.- By turning the'ecc'entric one-fourth' around, to the position seen in g. 4, the connection has been shortened one-half the'extent of the eccentric, turned further around to the reverse of fig. 1, and the other extreme is reached. 'That is the Shortest connection.

Various devices may be arranged for holding the plate O to prevent its turning, and also for the adjust ment of the eccentric.

A convenient adjustment for the eccentric is made by placing centrally through the plate E a shaft, H, t0 whichl an arm, I, is xed, its end slotted, as at t, fig. 3, so as to catch upon the-stud n, upon the eccentric. Therefore, to adjust the connection, turn the shaft H., and the arni I will. carry the eccentric to the desired position.

Havn described my invention,

What claim as new and useful, and desire to secure by Letters Patent, is. l v

The plate O, 'arranged so as to havea recipro'fating movement imparted thereto, combined with lthe eccentric D,arranged so as to` adjust the plate C to vary the point of starting and stopping of thc said reciprocating movement.

Witnesses: R. B. PERKINS.

DEVILLE H. PLA'r'r, l GEO. W. SMITH. 

